Trouble trying to access KVM code in ubuntu 14.04

Question

My virtualization project requires me to make changes in the vmx.c file of KVM.I have installed KVM in my Ubuntu 14.04 OS and am done launching an instance too.Yet,when I look up for vmx.c in the system,I do not find it.I though find a vmx.h file in the following directory /usr/src/linux-headers-3.19.0-30/arch/x86/include/asm.It would be really helpful if someone could guide me as to how do I go about it.Thank you in advance!

Answer 1

To be able to modify KVM without recompiling all the kernel, you can use Jan Kiszka's repo for building an external KVM module as following:

git clone git://git.kiszka.org/kvm-kmod.git
cd kvm-kmod
git submodule update --init
./configure
make sync
make

You can find after that the files you need in kvm-kmod/x86/ and you can modify them as you need. To install your modified version you can use run from the kvm-mod directory:

    make
    sudo su
    rmmod kvm-intel
    rmmod kvm
    insmod kvm
    insmod kvm-intel

You can put these commands in a script file to avoid typing them each time ;)